3.3 Adjustment. Vega VEGACAL 63

3 Product description

1

Voltage supply

10

2

3

Fig. 3: Functional principle - Plate capacitor

1 Distance between the electrode surfaces

2 Size of the electrode surfaces

3 Type of dielectric between the electrodes

The probe and the vessel wall are the capacitor plates. The measured product and the insulation are the dielectric. Due to the higher dielectric constant of the insulation and the conductive product compared to air, the capacitance increases as the probe is gradually covered.

The capacitance as well as the resistance change are converted by the electronics module into a level-proportional signal.

4 … 20 mA/HART two-wire electronics for voltage supply and measured value transmission on the same cable.

The supply voltage range can differ depending on the instrument version.

The data for power supply are specified in chapter "Technical data".

The backlight of the display and adjustment module is powered by the sensor. The prerequisite for this is a supply voltage at a certain level. The exact voltage specifications are stated in chapter "Technical

data".

The optional heating requires its own power supply. You can find further details in the supplementary instructions manual "Heating for

display and adjustment module".

This function is generally not available for approved instruments.

3.3 Adjustment

The instrument can be adjusted with the following adjustment media:

• With the display and adjustment module with the suitable VEGA DTM in conjunction with an adjustment software according to the FDT/DTM standard, e.g. PACTware and

PC

• With manufacturer-specific adjustment programs AMS™ or PDM

With a HART handheld

VEGACAL 63 • 4 … 20 mA/HART - two-wire